Ubuntu 18.04, unboud 1.6.7 and python module

Christian Kelinski c.kelinski at emetriq.com
Thu Aug 13 08:21:10 UTC 2020

Hi Wouter,

thanks for your suggestions which I implemented!

I was able to get the script running with a self compiled Ubuntu 1.6.7 (the version used by Ubuntu 18.04) without any problems (with qstate.qinfo.qname_str) so I think the problem is with the Ubuntu 18.04 package.

The python-unbound package behaves a bit odd - it installs a python2 module but strace shows unbound is using python3. I opened a bug report @ launchpad.net.

Greetings from Hamburg

Am 05.08.20, 12:35 schrieb "Unbound-users im Auftrag von Wouter Wijngaards via Unbound-users" <unbound-users-bounces at lists.nlnetlabs.nl im Auftrag von unbound-users at lists.nlnetlabs.nl>:

    Hi Christian,

    If I try this with the latest version from the code repository, I can
    make it work just fine.  I guess it would also work with unbound 1.11.0.

    It turns out to work just fine with qname_str=qstate.qinfo.qname_str
    Also the qnamelisttostr can work with ".".join.
    The python_script variable has changed to a config_strlist in the newer
    releases, and thus I included something to print that correctly.
    The list for that python_script config parameter means you can load
    multiple python scripts by having more than one python-script: "file"
    line in the config file, and in that order, having more than one
    "python" element in the module-config list of modules.  For here, it is
    only a type change and the script is easily fixed to print that right.
    Or print env.cfg.python_script.str the first element in the list.

    Perhaps these issues are already fixed as part of Python-3 related fixes
    in the code base.

    Here is the changes:

    --- test2.py.orig	2020-08-05 12:06:38.739887060 +0200
    +++ test2.py	2020-08-05 12:25:21.826634657 +0200
    @@ -4,13 +4,17 @@
     debugModule = True

     def qnameListToStr( qname_list ):
    -    qname_list_decode = list()
    -    for l in qname_list:
    -        qname_list_decode.append( l.decode('utf-8') )
    -    return ".".join( qname_list_decode )
    +    return ".".join(qname_list)
    +def strlisttostr( str_list ):
    +    thelist = list()
    +    while str_list is not None:
    +        thelist.append(str_list.str)
    +        str_list = str_list.next
    +    return " ".join( thelist )

     def init_standard(id, env):
    -    log_info("aws-hostnames: init called, module id is %d port: %d
    script: %s verbosity: %s" % (id, env.cfg.port, env.cfg.python_script,
    +    log_info("aws-hostnames: init called, module id is %d port: %d
    script: %s verbosity: %s" % (id, env.cfg.port,
    strlisttostr(env.cfg.python_script), env.cfg.verbosity))

         # Build pattern for checking, pattern matches everything like
         # ip-[0-9]-[0-9]-[0-9]-[0-9].domain.name
    @@ -39,6 +43,7 @@
             return True

         elif event == MODULE_EVENT_MODDONE:
    +        #qname_str = qstate.qinfo.qname_str
             qname_str = qnameListToStr(qstate.qinfo.qname_list)
             log_info("python: MODDONE with rcode '%s' and priming '%s' and
    query '%s' of type '%s'" % (
                         qstate.return_rcode, qstate.is_priming, qname_str,

    Best regards, Wouter

    On 05/08/2020 11:41, Christian Kelinski via Unbound-users wrote:
    > Hi,
    > we have a unbound python modul up and running which resolves Hostnames like ip-1-2-3-4.some.domain to Currently our environment is Ubuntu 16.04 and unbound 1.5.8.
    > Since Ubuntu 16.04 is EOL in some months I want to update our Servers to Ubuntu 18.04. But the module is not working anymore.
    > First it seems that accessing qstate.qinfo.qname_str in operate() doesn't work. I get an error:
    > error: pythonmod: Exception occurred in function operate, event: module_event_moddone
    > No big deal since the info could be retrieved from qstate.qinfo.qname_list
    > But when calling msg.set_return_msg(qstate) with a DNSMessage Object which has the answer appended it always fails (and unbound returns SERVFAIL). I compiled the documentation for unbound 1.6.7 and tried the "Response generation" example without luck.
    > I both tried python2 and python3 with same results.
    > With some small modifications I got the module up and running with Ubuntu 20.04 which ships with unbound 1.9.4. This modified version also works with Ubuntu 18.04 and a from source compiled unbound 1.11.0.
    > I attached the module to this E-Mail. Doing a "dig
    > I seems I'm missing something since - based on the documentation - I doing it okay __ Has someone experienced something similar with Ubuntu 18.04/unbound 1.6.7?
    > Thanks in advance and thanks for creating such a lovely software!
    > Christian
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